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在沉积物微观宇宙中,与宿主相关的细菌和线粒体DNA标记物的微分衰变

Wenjing Ren¹, Yucheng Feng¹

¹Department of Crop, Soil and Environmental Sciences, Auburn University, Auburn, AL 36849, USA.

|December 28, 2025

概括

沉积物含有便细菌,这项研究追踪了40天内淡水沉积物中的遗传标记物. 与宿主相关的标记物比一般标记物衰变得更快,这凸显了标记物类型和来源在评估污染中的重要性.

科学领域:

环境微生物学环境微生物学
分子生态学分子生态学
评估水质水质的评估.

背景情况:

水中沉积物充当便细菌的储存库,但它们的持久性尚未得到充分研究.
传统的水质监测往往忽视了与沉积物相关的微生物污染.
与宿主相关的遗传标记为源追踪提供了潜力,但它们在沉积物中的稳定性需要研究.

研究的目的:

研究各种宿主相关遗传标记物 (细菌和线粒体DNA) 和淡水沉积物中的一般标记物的持久性.
为了比较来自人类,牛和便来源的不同遗传标记物的衰变率.
与可培养大肠杆菌 (E. coli) 的减少相关联,并评估便来源对不活化时间的影响.

主要方法:

使用带有哨兵室的实验室微观宇宙来模拟沉积物环境.
微观宇宙被污水,牛便或含有特定遗传标记的家禽垃圾 (例如,HF183,HcytB,CowM3,QMIBo,LA35,Chicken-ND5,AllBac) 填充.
量化聚合酶连锁反应 (qPCR) 用于量化标志物在40天的持续时间内持久性,并与大肠杆菌可培性测试一起使用.

主要成果:

所有与宿主相关的细菌和线粒体DNA (mtDNA) 标记物都表现出一级或双相衰变模式.
与宿主相关的细菌标记物比它们相应的mtDNA标记物衰变得更快.
一般的细菌菌标记物 (AllBac) 显示出比宿主相关标记物更大的稳定性和持久性. 大肠杆菌的无活化与大多数标记物具有正相关性,除了牛的mtDNA. 牛和家禽便来源显示,与污水相比,大肠杆菌减少时间更长.

结论:

遗传标记物的类型 (细菌与mtDNA) 和便来源显著影响淡水沉积物的持久性和衰变率.
一般标记物AllBac表现出更高的稳定性,这表明它对于检测便污染的实用性.
了解标记物无活化变异性对于开发准确的预测模型来评估水中沉积物中的微生物风险至关重要.

关键词:

腐烂衰变的原因是什么与宿主相关的标记物微生物源追踪微生物源追踪沉积物沉积物是一种沉积物.

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